• Particle and aerosol research
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• v.19 no.3
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• pp.63-76
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• 2023

An electrostatic precipitator (ESP) has a low pressure drop and a high collection efficiency but its collection efficiency can be reduced due to dust accumulation on the collection plates during long-term operations. In order to maintain the initial dust collection efficiency, it is necessary to periodically clean the collection plates. The common cleaning methods are using physical impacts or water sprays. These cleaning methods can lead to damage to the collection plate or generate wastewater. Herein, we implemented an electrodynamic screen (EDS) for ESP cleaning and evaluated its surface cleaning performance of particles. The EDS is an electrostatic system that can electrostatically repel particles on surfaces, allowing it to clean the ESP without causing damage and wastewater generation. Our evaluation included the analysis of the effects of AC voltage characteristics, electrode configuration and environmental conditions on the cleaning performance of the EDS with the aim of achieving effective surface cleaning. It has been demonstrated that activating the EDS cleans up to 65% of the particles on the surface, which indicates about 94% of our target cleaning zone.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.07a
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• pp.29-32
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• 2016

본 논문에서는 나로호(KSLV-I) 비행상태의 실시간 감시를 목적으로 국내에서는 처음 개발된 우주센터 원격수신자료전시시스템(EDS)의 구축과 운용을 소개한다. EDS는 우주센터 발사통제시스템의 주요 시스템 중 하나이고 그 역할은 위성발사체의 비행에 중대한 영향을 주는 주요정보(QLM)와 궤적정보(TSPI)를 수신하여 실시간으로 처리함으로써 탑재 서브시스템별 전문가들이 위성발사체의 비행 상태를 감시할 수 있도록 지원하는 것이다. EDS는 3회에 걸친 나로호 비행시험에서 그 역할에 따라 매회 8대가 운영되었으며 임무를 성공적으로 수행하였다. 본 시스템을 기반으로 추후 발전된 형태의 한국형발사체(KSLV-II) 비행상태의 실시간 감시시스템의 구축이 가능할 것으로 예상된다.

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.502-503
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• 2011

최근 환경 문제 및 화석 에너지의 고갈과 맞물려 신재생 에너지를 사용하는 DC 출력형 분산전원 시스템이 증가 일로에 있으며, 이에 따라 교류 급전시스템보다 에너지 변환 효율이 높은 직류 급전 시스템에 대한 연구개발이 활발히 이뤄지고 있다. 본 논문에서는 유지 보수의 용이성을 확보한 Hot Swap 구조형식의 DC 급전용 100[kW]급 분산 제어기반 모듈형 ESS[Energy Storage System의 개발에 관한 것이다. 실제 33[kW]급 모듈 3대로 구성된 100[kW]급 시스템을 제작하여 전압제어 실험, 병렬운전실험 및 Hot Swap 안정성 실험 등을 수행하였다.

• Proceedings of the KIEE Conference
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• 2008.04b
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• pp.174-175
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• 2008

초고압 변전소의 주요설비인 가스절연개폐장치(GIS: Gas Insulated Switchgear)의 신뢰도를 높이기 위해서는 절연체 내부에서 발생하는 부분방전을 사전에 진단하여 예방을 하는 것이 중요하다. 현재 이에 대한 진단장치 개발이 이루어지고 있으며 GIS On-line System 장치 및 휴대용 진단장비가 국내에서 제작되고 있으나 On-line System은 고가의 비용이 들고 휴대용 진단장비는 상시감시가 어렵다는 단점을 가지고 있다. 이러한 단점을 보완하기 위해서 본 연구내용에서는 저가이면서 상시 PD 감시능력을 가진 PD 카운터에 대해 설명하고 GIS 현장에 실제 적용한 자료와 휴대용 진단장비와 함께 비교 적용한 자료를 가지고 PD 카운터의 특성을 확인하는데 역점을 두었다.

• Journal of information and communication convergence engineering
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• v.9 no.2
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• pp.177-182
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• 2011

Considerations for user-centric environments are regarded as essential for the successful deployment of convergence services in BcN. Event driven service (EDS) is regarded as a typical convergence service converging different functions of multiple service providers to support user-centric environments. This paper first describes the deployment model and service scenario of EDS, a convergence service for user-centric environments in BcN. The user-centric environments stimulates the unified identifier management, namely unified identification (U-ID), to enable users to be provided convergence services without awareness of multiple providers. Then the designed structure and implementation results are given.

• Korean Journal of Veterinary Research
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• v.47 no.1
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• pp.91-94
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• 2007

tisue disease of dog and cat, resembling Ehlers-Danlos syndrome (EDS) in man. EDS is characterizedby loose, hyperextensible and, fragile skin, it is attributed to mutations in connective tisue gene. Thesemutations cause defects in type I or II collagen synthesis and as a result lack of strength or elasticityto skin, joint, ligament and vessels. EDS-affected animals often experience subcutaneous hematomas thathave long bleeding times. The 4-years old male Yorkshire terrier was evaluated because of subcutaneoushematoma after stifle surgery. Clinical examination revealed a thin and hyperextensible skin and jointlaxity. The degree of skin extensibility index was 23.4%, marked skin stretchy. Clinical diagnosis wasconfirmed by histophathological examination of a skin biopsy revealing reduced packing density ofcollagen fiber of skin.

• Journal of the Korea Society for Simulation
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• v.11 no.3
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• pp.49-58
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• 2002

It takes 2 or 3 months to manufacture memory device. Defect has to exist owing to hundreds of processes. If there are too many defects, the memory has to be rejected. But if there are a few defects, it will be more efficient and cost reducing for the company to use it by repairing. Therefore, laser-repair process is needed for such a reason and redundancy analysis is needed to establish correct target of laser-repair process. The equipment development company had provided the redundancy analysis and each development company had developed and provided separately. So, to analyze the similar type of defects, redundancy analysis time can be very different by the manufacture. The purpose of this research is to strengthen the competitive price and to apply correlation concept in business for reducing the redundancy analysis time to repair the defects

• Proceedings of the KIEE Conference
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• 2009.04b
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• pp.198-200
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• 2009

This paper presents the numerical simulation results on the moving type electrodynamic suspension (EDS) simulator. Superconducting EDS system is generated by the interaction between the magnetic field made by the induced the eddy current in the ground conductor and the moving magnetic field made by onboard superconducting magnet. The levitation force of EDS system, which is proportional to the strength of the moving magnetic field, becomes saturated according to the increase of the velocity Especially, the levitation force is influenced by the structure of HTS magnet and ground conductor. The 3-D numerical analysis with FEM was used to find the distribution of the magnetic field, the optimal coil structure, and the calculation of the levitation force.

• Applied Microscopy
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• v.45 no.3
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• pp.131-134
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• 2015

Here we show how by processing energy dispersive X-ray spectrometry (EDS) data obtained using highly sensitive, new generation EDS detectors in the AZtec LayerProbe software we can obtain data of sufficiently high quality to non-destructively measure the number of layers in two-dimensional (2D) $MoS_2$ and $MoS_2/WSe_2$ and thereby enable the characterization of working devices based on 2D materials. We compare the thickness measurements with EDS to results from atomic force microscopy measurements. We also show how we can use electron backscatter diffraction (EBSD) to address fabrication challenges of 2D materials. Results from EBSD analysis of individual flakes of exfoliated $MoS_2$ obtained using the Nordlys Nano detector are shown to aid a better understanding of the exfoliation process which is still widely used to produce 2D materials for research purposes.

• Proceedings of the KIPE Conference
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• 2010.11a
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• pp.202-204
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• 2010

본 논문은 DC 급전시스템에 적용 가능한 25[kW]급 계통연계 태양광 PCS 개발에 관한 것이다. 전력 회로는 넓은 범위의 입력 전압대에서 출력 전류가 조절 가능 하도록 Fixed Frequency Series Resonant Converter(SR Converter)로 구성하였으며, 스위칭 손실을 극소화 시킬 수 있는 ZVZCS 동작을 구현 하였으며, PWM 기법으로는 위상 천이 방식을 사용하였다. 제안한 DC 계통 연계형 태양광 PCS 시스템 동작에 대한 P-sim 시뮬레이션을 수행하였으며, 25[kW] Prototype을 제작하여 시뮬레이션 결과와 비교 실험을 수행하였다